I have some art work that is 18" tall by 36" wide. I have no idea how to create this print size as the program does not identify that as a print size. Once the program identifies it I will just select PDF as my printer and print it as a PDF file. Question is, how do I do that?
Thank you for all your help,
Randy
Do you have a particular reason for not using File > Publish to PDF ?
If your design page is 18" x 36" then that is the size of the PDF that Publish to PDF will create. You should probably add crop marks and bleed unless your printing company tells you not to. Crop marks and bleed will be created outside the design page, but the PDF will contain appropriate trim and crop boxes so although you see more than 18 x 36" in the viewer a decent imposition program will know how to correctly align the PDF on the printing plate.
If you particularly want to do it through a PDF print driver, you will need to create a custom page size in the print driver. But I'm not sure a PDF print driver will be able to properly cope with placing bleed or cropmarks outside the design page.